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Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Selling, general and administrative expenses      
Equity based compensation arrangements [Roll Forward]      
Expense related to equity based compensation arrangements $ 4,500 $ 2,100 $ 3,900
Stock Appreciation Rights      
Equity based compensation arrangements [Roll Forward]      
Award liability as of beginning of period 24,205 23,458  
Amounts redeemed (583) (825)  
Change in fair value 3,173 1,572  
Award liability as of end of period 26,795 24,205 23,458
Current liabilities related to plans 1,305 624  
Long-term liabilities related to plans $ 25,490 23,581  
Settlement period 5 years    
Deferred Compensation      
Equity based compensation arrangements [Roll Forward]      
Award liability as of beginning of period $ 1,660 1,695  
Amounts redeemed 0 (108)  
Change in fair value 215 73  
Award liability as of end of period 1,875 1,660 1,695
Current liabilities related to plans 0 0  
Long-term liabilities related to plans $ 1,875 1,660  
Settlement period 5 years    
Redeemable Noncontrolling Interests      
Equity based compensation arrangements [Roll Forward]      
Award liability as of beginning of period $ 8,300 12,498  
Amounts redeemed 0 (4,644)  
Change in fair value 1,073 446  
Award liability as of end of period 9,373 8,300 $ 12,498
Current liabilities related to plans 0 0  
Long-term liabilities related to plans $ 9,373 $ 8,300  
Settlement period 5 years